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PCA9551BS Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCA9551BS
Beschreibung 8-bit I2C LED driver with programmable blink rates
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 21 Seiten
PCA9551BS Datasheet, Funktion
INTEGRATED CIRCUITS
PCA9551
8-bit I2C LED driver with programmable
blink rates
Product data sheet
Supersedes data of 2003 May 05
2004 Oct 01
Philips
Semiconductors






PCA9551BS Datasheet, Funktion
Philips Semiconductors
8-bit I2C LED driver with programmable blink rates
Product data sheet
PCA9551
PSC1 — FREQUENCY PRESCALER 11
bit 7 6 5 4 3 2 1 0
default 1 1 1 1 1 1 1 1
PSC1 is used to program the period of PWM output.
The
period
of
BLINK1
+
(PSC1 ) 1)
38
NOTE:
1. Prescaler calculation is different between the PCA9551 and
other PCA955x LED Blinkers. A divider ratio of 38 instead of 44
is used. This different divider ratio causes the blinking frequency
to be 13% (1 – 38/44) lower when the same 8-bit word is used.
The programmed value of the FREQUENCY PRESCALER must
be adjusted to compensate for this difference in applications
where the PCA9551 is used in conjunction with other PCA955x
LED Blinkers and the observed blinking frequencies need to be
the same.
PWM1 — PWM REGISTER 1
bit 7 6 5 4 3 2 1 0
default 1 0 0 0 0 0 0 0
The PWM1 register determines the duty cycle of BLINK1. The
outputs are LOW (LED off) when the count is less than the value in
PWM1 and HIGH when it is greater. If PWM1 is programmed with
00h, then the PWM1 output is always LOW (LED off).
The duty cycle of BLINK1 is:
256 – PWM1
256
LS0 — LED0–3 SELECTOR
LED 3
LED 2
LED 1
LED 0
bit 7 6 5 4 3 2 1 0
default 0 1 0 1 0 1 0 1
LS1 — LED4–7 SELECTOR
LED 7
LED 6
LED 5
LED 4
bit 7 6 5 4 3 2 1 0
default 0 1 0 1 0 1 0 1
The LSx LED select registers determine the source of the LED data.
00 = Output is set LOW (LED on)
01 = Output is set Hi-Z (LED off – default)
10 = Output blinks at PWM0 rate
11 = Output blinks at PWM1 rate
PINS USED AS GENERAL PURPOSE I/Os
LED pins not used to control LEDs can be used as general purpose
I/Os.
For use as input: Set LEDx to high-impedance (01) and then read
the pin state via the input register.
For use as output: Connect external pull-up resistor to the pin and
size it according to the DC recommended operating characteristics.
LED output pin is HIGH when the output is programmed as
high-impedance, and LOW when the output is programmed LOW
through the “LED selector” register. The output can be pulse-width
controlled when PWM0 or PWM1 are used.
POWER-ON RESET
When power is applied to VDD, an internal Power-On Reset holds
the PCA9551 in a reset condition until VDD has reached VPOR. At
this point, the reset condition is released and the PCA9551 registers
are initialized to their default states, all the outputs in the off state.
Thereafter, VDD must be lowered below 0.2 V to reset the device.
EXTERNAL RESET
A reset can be accomplished by holding the RESET pin LOW for a
minimum of tW. The PCA9551 registers and I2C state machine will
be held in their default state until the RESET input is once again
HIGH.
This input requires a pull-up resistor to VDD if no active connection is
used.
2004 Oct 01
6

6 Page









PCA9551BS pdf, datenblatt
Philips Semiconductors
8-bit I2C LED driver with programmable blink rates
Product data sheet
PCA9551
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134)
SYMBOL
PARAMETER
VDD
VI/O
II/O
ISS
Ptot
Tstg
Tamb
Supply voltage
DC voltage on an I/O
DC output current on an I/O
Supply current
Total power dissipation
Storage temperature range
Operating ambient temperature
CONDITIONS
MIN
–0.5
VSS – 0.5
–65
–40
MAX
6.0
5.5
±25
100
400
+150
+85
UNIT
V
V
mA
mA
mW
°C
°C
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is desirable to take
precautions appropriate to handling MOS devices. Advice can be found in Data Handbook IC24 under ”Handling MOS devices”.
DC CHARACTERISTICS
VDD = 2.3 V to 5.5 V; VSS = 0 V; Tamb = –40 °C to +85 °C; unless otherwise specified. TYP at 3.3 V and 25 °C.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
Supplies
VDD Supply voltage
IDD Supply current
Istb Standby current
IDD
Additional standby current
VPOR Power-on reset voltage (Note 1)
Input SCL; input/output SDA
Operating mode; VDD = 5.5 V;
VI = VDD or VSS; fSCL = 100 kHz
Standby mode; VDD = 5.5 V;
VI = VDD or VSS; fSCL = 0 kHz
Standby mode; VDD = 5.5 V; Every
LED I/O at VIN = 4.3 V; fSCL = 0 kHz
No load; VI = VDD or VSS
2.3 —
— 350
— 1.9
——
— 1.7
5.5
500
3.0
800
2.2
VIL
VIH
IOL
IL
CI
I/Os
LOW-level input voltage
HIGH-level input voltage
LOW-level output current
Leakage current
Input capacitance
VOL = 0.4 V
VI = VDD = VSS
VI = VSS
–0.5
0.7 VDD
3
–1
6.5
3.7
0.3 VDD
5.5
+1
5
VIL LOW-level input voltage
VIH HIGH-level input voltage
IOL LOW-level output current
IL Input leakage current
CIO Input/output capacitance
Select Inputs A0, A1, A2 / RESET
VOL = 0.4 V; VDD = 2.3 V; Note 2
VOL = 0.4 V; VDD = 3.0 V; Note 2
VOL = 0.4 V; VDD = 5.0 V; Note 2
VOL = 0.7 V; VDD = 2.3 V; Note 2
VOL = 0.7 V; VDD = 3.0 V; Note 2
VOL = 0.7 V; VDD = 5.0 V; Note 2
VDD = 3.6 V; VI = 0 or VDD
–0.5 —
2.0 —
69
8 11
10 14
11 14
14 18
17 24
–1 —
— 2.1
0.8
5.5
1
5
VIL LOW-level input voltage
–0.5 —
0.8
VIH HIGH-level input voltage; A0 / RESET
2.0 —
5.5
VIH HIGH-level input voltage; A1 / A2
2.0 — VDD + 0.5
ILI Input leakage current
–1 —
1
CI Input capacitance
VI = VSS
— 2.3
5
NOTES:
1. VDD must be lowered to 0.2 V in order to reset part.
2. Each I/O must be externally limited to a maximum of 25 mA and the device must be limited to a maximum current of 100 mA.
UNIT
V
µA
µA
µA
V
V
V
mA
µA
pF
V
V
mA
mA
mA
mA
mA
mA
µA
pF
V
V
V
µA
pF
2004 Oct 01
12

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